Transcript

Slide 1-

All About the Menstrual Cycle

Slide 2-

Biology and the Menstrual Cycle • Menstrual cycle is regulated by fluctuating
levels of sex hormones
These hormones produce certain changes in
the ovaries and uterus
Humans are nearly unique among species in
having a menstrual cycle
Other species of mammals have estrous
cycles

During which days of the cycle is FSH at its lowest? FSH: follicle stimulating hormones is at its lowest during the last days of the cycle

Slide 8-

When FSH levels are low what is the size of the follicle It is shrinking and disappearing while a new set is growing

Slide 9-

What is happening to estrogen during the follicle phase?
It dips then rises
In response the uterus lining dips then rises

Slide 10-

Ovulation Day 14 of the cycle usually marks an event called ovulation
follicle ruptures open and releases the ripened egg
Pituitary hormones: LH and FSH are peaking
Estrogen is also released from follicle

Slide 11-

Hormones and What Happens in the Ovaries • Luteal phase - after releasing an egg, the follicle turns into the corpus luteum
– The corpus luteum manufactures progesterone
• Menstruation - shedding of the inner lining of the uterus

Slide 12-

Length and Timing of the Cycle Normal menstrual cycle = 20 to 36 to 40 days;
average is about 28 days
– Menstruation begins on day 1 and continues until about
day 4 or 5
– Follicular phase extends from about day 5 to about day
13
– Ovulation occurs on day 14
– Luteal phase extends from day 15 to the end of the
cycle, day 28

Slide 13-

Other Cyclic Changes Two other physiological processes fluctuate
with the menstrual cycle:
– The cervical mucus cycle
– The basal body temperature cycle

Slide 14-

ppt slide no 14 content not found

Slide 15-

Fluctuations in Performance • Research on intellectual or athletic
performance generally shows no
fluctuations over the cycle
• Research on academic performance,
problem solving, memory, or creative
thinking shows no fluctuations over the
cycle

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